The assistant professor

The World of Circles defines a circle and its parts. Animated graphics illustrate and explain radius, diameter, circumference, and area. Special attention is given to illustrating the concept of Pi. For grades 4-9.

Fractions and all their parts-part III covers the addition and subtraction of fractions and mixed numbers.

Fractions and all their Parts-Part I describes what fractions are and why they are useful. Numerator and denominator are defined and illustrated.

Fractions and all their parts is a three-part series that combines colorful animated graphics with imaginative examples to explain fractions and how they are used and manipulated.

Shows how to express simple problems in the form of "mathematical sentences," and introduces the idea of using a symbol to hold a place for a value. Unknown numbers are explained and expanded to include variables.

Combines colorful animated graphics with imaginative examples to explain the pythagorean theorem and its uses.

The World of Circles defines a circle and its parts. Animated graphics illustrate and explain radius, diameter, circumference, and area. Special attention is given to illustrating the concept of Pi. For grades 4-9.

Combines colorful animated graphics with imaginative examples to explain the pythagorean theorem and its uses.